RES160 – 263 – further resolves 1 that the studies referred to in resolves to invite ITU-R 3 and 4 include sharing and compatibility studies to ensure protection of existing services allocated in the frequency ranges identified and, as appropriate, adjacent band studies, taking into account studies already performed in ITU-R; 2 that modifications studied under resolves to invite ITU-R 3 shall not consider the use of HAPS links in the frequency bands subject to Appendix 30B; 3 to develop ITU-R Recommendations and Reports, as appropriate, on the basis of the studies called for in resolves to invite ITU-R 1, 2, 3, and 4 above, invites administrations to participate in the studies and to provide input contributions, resolves to invite the 2019 World Radiocommunication Conference to consider the results of the above studies and take necessary regulatory actions, as appropriate, provided that the results referred to in resolves to invite ITU-R are complete and agreed by ITU-R study groups.